Honors Urinalysis Home
Middle Aged Woman
Case Study
Teenage Boy Case
Study
2. What medical condition is the most likely cause of the side and back pain?
The side and back pain is most likely due to renal calculi from cystinuria, which is a disease that affects renal tubular absorption of amino acids. It is worse at night when the urine is concentrated, which is why his pain increased while he slept. Other crystals, especially calcium oxalate, may be present in addition to cystine.
A 14 year old boy went to his doctor complaining of severe side and back pain, which got worse while he slept. His family history showed males on both his mother's side and his father's side with chronic kidney stones. Urinalysis results are:
| Color |
yellow |
Protein |
negative |
Blood |
small |
| Appearance |
cloudy |
Glucose |
negative |
Urobilinogen |
normal |
| Sp.
Gravity |
1.025 |
Ketones |
negative |
Nitrite |
negative |
| pH |
6.0 |
Bilirubin |
negative |
Leukocyte |
negative |
Microscopic
10-20 RBCs/hpf Few Calcium Oxalate crystals
Many crystals which look like this:
