Honors Urinalysis Home
Middle Aged Woman
Case Study
Teenage Boy Case
Study
1. What is the name of the major crystal present?
The major crystal present is cystine, which is an amino acid. Cystine has the very characteristic shape of a benzene ring. Below are two more photomicrographs of classic cystine.
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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:
