Greener Journal of Medical Sciences
Vol. 5 (3), pp. 048-052, June, 2015
ISSN: 2276-7797; ICV: 5.98
Copyright ©2015, the copyright of this article is retained by the author(s)
Dipstick Urinalysis in Apparently Healthy Neonates in Port Harcourt
*1YAGUO Ide Lucy Eberechukwu, 1OPARA Peace Ibo, 1UCHENWA-ONYENEGECHA Tochi Ada
Greener Journal of Medical Sciences, vol. 5 (3), pp. 048-052, June, 2015
1Department of Paediatrics and Child Health, University of Port Harcourt Teaching Hospital. Port Harcourt, Rivers State, Nigeria, West Africa P.M.B 6173.
Article No.: 030815042
Background: Dipstick urinalysis, which is a simple but very important diagnostic procedure in paediatric nephro-urology, provides information about multiple physicochemical properties of urine. It detects common urinary abnormalities in children which could result from a wide range of conditions. Proteinuria, haematuria and glycosuria for example may be pointers to serious underlying pathologies in the newborn. This study was undertaken to determine baseline findings on dipstick urinalysis in healthy neonate in Port Harcourt as there is paucity of such a study in our environment.
Methods: This descriptive study was conducted in the post natal wards of the University of Port Harcourt Teaching Hospital. Dipstick urinalysis was carried out on clean catch urine samples from 180 healthy full-term and near term breast-fed neonates, without maternal morbidities or personal pathological antecedents within the first 48 hours of life.
Results: Gestational ages ranged from 35 -42 weeks mean of 38.54± 1.38, mean birth weight of 3.26 ± 0.55kg and a male: female ratio of 1: 1.1. Haematuria glycosuria and ketonuria were not identified in any baby. All urine samples were also negative for nitrites and leucocytes. Proteinuria was present in 3 (1.7%) of the babies.
Conclusion: Haematuria , glycosuria and ketonuria are not common in apparently healthy neonates in Port Harcourt. Presence of nitrites and leucocytes are unusual. Proteinuria, haematuria and glycosuria in the neonates should be further investigated for underlying pathologies.
Yaguo Ide Lucy Eberechukwu
E-mail: lucyaguolucy@ gmail.com
Dipstick urinalysis, healthy, neonates
Urinalysis is recognized as a simple and inexpensive method for screening healthy children for renal abnormalities and the dipstick method is the most commonly implemented procedure. Shagari et al (2007), Whiting et al (2006) It is easy to perform and does not require sophisticated training of personel. Whiting et al (2006), Mcpherson (2007) Urinary abnormalities are commonly detected in children and could result from a wide range of conditions Mc Taggart (2005) or may be transient in some cases.Mcpherson (2007)
Dipstick urinalysis provides information about multiple physiochemical properties of urine. Mcpherson (2007) Abnormal dipstick urinalysis can result from pathologic and non pathologic causes although not all abnormal results are clinically significant as false positive and negative results are also common.Patel (2006)
Proteinuria and haematuria are amongst the early manifestations of renal disease, in general proteinuria is more significant than haematuria. Akor et al (2009) Studies have shown that positive urine test for proteinuria and /or haematuria were significant predictors of end stage renal disease. Iseki et al(1996), Gansevoort et al (2006) Nitrite and leucocyte in urine can be used to diagnose urinary tract infection(UTI) which may be subclinical or present with non specific symptoms or signs and have potential for serious long term complications if not treated promptly.Gorelick and Shaw(1999), Whiting et al (2005) It has been shown that , the result from dipstick urinalysis alone compares favourably with combination of urinalysis and urine culture in diagnosis of urinary tract infection among febrile neonates suggesting that dipstick urinalysis alone may be an adequate screening test for UTI. Glissmeyer et al (2014) Biliubinuria is a reflection of conjugated hyperbilirubinaemia and tends to suggest obstructive jaundice (intra and extra hepatic). Ibe (2007).
In neonates, renal abnormalities may be traced to specific inherited or congenital problems or to intrauterine or postnatally acquired events.Guignard and Drukker(2000) Routine newborn urinalysis screening is not practiced in most hospitals and studies on dipstick urinalysis among apparently healthy neonates are limited in southern Nigeria. This study aims to determine baseline findings on dipstick urinalysis among apparently healthy newborns in Port Harcourt.
MATERIALS AND METHODS
This descriptive study was conducted in the post natal wards of the University of Port Harcourt Teaching Hospital over a 6month period, from January to June 2013.
Informed consent was obtained from the parents/caregivers before recruiting subjects for the study. Voided urine samples were obtained within the first 48hours of life from 180 apparently healthy full term and near term breastfed newborns who had a normal perinatal period. Neonates with maternal morbidity or personal pathological antecedents like antenatally diagnosed hydronephrosis or congenital anomalies were excluded.
The urine samples were collected by clean catch method. Appearance and colour of the urine, were noted and the urine immediately tested by the dipstick method using Coombi 10 reagent strips. Parameters tested included PH, specific gravity, protein, blood, glucose, leucocyte, nitrite, urobilinogen, bilirubin and ketone. The results of dipstick tests were recorded as (±) for trace; (1+), (2+), and (3+) for varying degrees of proteinuria; normal, negative (−) or positive (+) for urobilinogen for other parameters ( blood, ketone, glucose, bilirubin, nitrite and leucocyte). Proteinuria of 1+or more was considered significant.
Data was analysed using SPSS version 16.0 and presented as simple frequencies and in tables. Patients with significant abnormalities were referred to the nephrology unit for further evaluation.
There were 180 subjects. Table 1 shows the demographic characteristics of the study population. There were 85 males (47.2%) and 95 females (52.8%) with a male: female ratio of 1: 1.1. Gestational ages ranged from 35 -42 weeks with mean of 38.54± 1.38. The birth weights ranged from 1.8- 4.6kg with mean birth weight of 3.26 ± 0.55kg. The APGAR scores at 1 and 5 minutes ranged from 4-10 and 6-10 with mean of 7.88 ± 1.09 and 9.24 ±0.76 respectively.
Table 1 shows the demographic characteristics of the 180 apparently healthy newborns and Table 2 shows the dipstick urinalysis findings. Proteinuria was present in 3(1.7%) babies, 2 males and 1 female, all of which had trace proteinuria. Bilirubinuria was present in 11(6.1%) babies and all the babies who had bilirubinuria had normal urobilinogen in their urine. Haematuria, glucosuria and ketonuria were not identified in any baby and all urine samples were negative for nitrite and leucocyte. The urine pH ranged between 2-6, 4 babies had urine pH of 2 while 112 and 64 babies had urine pH of 5 and 6 respectively. The specific gravity (SG) of urine ranged from 1.010-1.020, 128 babies had SG of 1.010, 35 babies had SG of 1.015 and 17 had SG of 1.020.
The dipstick method is the most rapid screening procedure used in early detection of urinary tract diseases thus helping prevention and slowing progression to chronic kidney disease(CKD) Hajar et al(2011),Deville et al (2004). Our study revealed that 18 (10%) of the newborns had urine abnormalities: 3(1.7%) had proteinuria, 11 (6.1%) bilirubinuria and 4(2.2%) very low urine pH of 2 which was significant and therefore suggests that routine screening of apparently healthy newborns for urinary abnormalities is justified. The percentage of urine abnormalities in this study is higher than the prevalence cited by Falakaflaki et al(2011).This may be attributable to the fact that more urine abnormalities were tested for in our study.
Proteinuria and haematuria are important laboratory signs of renal disease.Akor et al(2009), Leung and Wong (2010). Proteinuria is considered an independent risk factor for CKD and thus warrants attention for early detection and prompt management.El- Taayeb et al(2010),Johnson et al(2012) In our study, none of the babies had significant proteinuria as all the 3(1.7%) babies had trace of protein in their urine. This contrasts with the report from a similar study carried out by Adedoyin et al(2000) among newborns in Illorin, Nigeria where proteinuria was identified in 77.5% of babies, this may be attributable to the high percentage of preterms (75%) among the babies studied. Falakaflaki et al (2011)however in their study among full term newborns reported that 5.75% of the babies had significant proteinuria. The reason for this is not clear but may suggest possible environmental /racial differences in proteinuria or probably because they had a larger sample size of 400 compared to ours with sample size of 180. In one study done by Ikimalo et al(2003) among 1010 asymptomatic children aged 6-17 years in Port Harcourt to screen for haematuria and proteinuria, the prevalence of significant proteinuria was 1% which was lower than the prevalence of 4.72% and 3.5% reported by Abdurrahaman et al(1978) and Akor et al(2009) respectively among similar age group in other parts of the country. This lower prevalence in our study and Ikimalo et al(2003) may suggest some environmental influence on the prevalence of Proteinuria. Proteinuria occurred more commonly in males which is in agreement with the findings in the study by Falakaflaki et al(2011). Haematuria was not seen in any baby in our study and is consistent with the findings of Edelmann et al(1973). Falakaflaki et al (2011) however reported very low prevalence of 0.25% (only one baby had haematuria). This may suggest that the finding of haematuria in the newborn should be further evaluated.
Glucosuria was not identified in any baby, this is consistent with the findings of Falakaflaki et al(2011) but contrasts with the report by Rhodes et al24 where glucosuria was seen in as high as 24% of babies. The reason for this disparity is not readily explainable. In another study conducted by Alharthi et al(2014) to screen for urine abnormalities among preschool children aged 3-6 years in western Saudi Arabia, glucosuria was seen in o.6% of children. This difference may probably be because of the different age group studied.
The presence of bilirubinuria which is a reflection of conjugated hyperbilirubinaemia tends to suggest obstructive jaundice. Ibe (2007). In our study 11(6.1%) babies had bilirubinuria. This cannot readily be explained because these babies were apparently normal and had normal urobilinogen in their urine. All urine samples were negative for nitrite and leucocyte in our study. On the contrary in a study done by Nebigil and Tumar(1992) to determine the prevalence of asymptomatic urinary tract infection among apparently healthy children aged 1day to 16 years, prevalence of 4% was reported among the newborns. The difference may be because of the difference in the ages of the newborns studied since we studied only newborns within the 1st 48hours of life.
Some studies have concluded that routine urine screening of infants is not very useful and should be performed only at ages 5 and above Abdurrahaman et al (1978), Simonetti and Konrad(2006)while others suggested that all patients should have routine urinalysis to identify the presence of unrecognized renal disease which may benefit from simple therapeutic measures. Kanef et al(2006) Routine urine screening in newborns is in no doubt helpful in diagnosis of underlying renal diseases in neonates and is cost effective and simple to perform.
Mild proteinuria may be seen in the normal newborn within the first 72hours of life however, the finding of significant proteinuria in newborns warrants repeat urinalysis to determine if it is transient or pathologic. Haematuria and glucosuria should also be further investigated for underlying pathologies. Presence of nitrites and leucocytes in the urine are unusual in apparently healthy neonates
Dipstick urinalysis should be done routinely for newborns. Babies with urine abnormalities, should be further evaluated to ascertain if such abnormalities are transient or actually pathologic so that such babies can be treated early to prevent or reduce associated morbidities.
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Cite this Article: Yaguo ILE, Opara PI, Uchenwa-Onyenegecha TA (2015). Dipstick Urinalysis in apparently healthy Neonates in Port Harcourt. Greener Journal of Medical Sciences, 5(3):048-052, http://doi.org/10.15580/GJMS.2015.3.030815042.