Urinalysis and Body Fluids Flashcards
6 cards from real ASCP practice questions. Tap to flip, then mark Knew It or Still Learning — missed cards come back until you master them.
Read the first 6 Urinalysis and Body Fluids flashcards as text
Bence Jones proteins detected in urine are composed of:
Answer: Free monoclonal light chains (kappa or lambda)
Bence Jones proteins are free monoclonal immunoglobulin light chains excreted in urine, characteristic of multiple myeloma.
Which urine finding indicates renal tubular damage in acute tubular necrosis?
Answer: Muddy brown granular and epithelial cell casts
Muddy brown granular casts and renal tubular epithelial (RTE) cell casts are pathognomonic for acute tubular necrosis.
Normal CSF total protein concentration is approximately:
Answer: 15–45 mg/dL
Normal CSF protein is 15–45 mg/dL in lumbar specimens; elevated protein (>45 mg/dL) suggests inflammation, infection, or blood-brain barrier disruption.
Which urine dipstick reaction can be falsely negative in the presence of high-dose ascorbic acid?
Answer: Glucose (oxidase method)
Ascorbic acid is a reducing agent that interferes with the glucose oxidase reaction, causing false-negative glucose results on dipstick.
A synovial fluid WBC of 50,000–200,000/µL with >90% PMNs is most consistent with:
Answer: Septic arthritis
Septic arthritis typically shows WBC >50,000/µL with >90% neutrophils; crystals and lower counts are seen in gout and inflammatory arthritis.
Which finding in amniotic fluid assessment indicates fetal lung maturity?
Answer: L/S ratio ≥2.0 with phosphatidylglycerol present
An L/S ratio ≥2.0 with phosphatidylglycerol present indicates adequate surfactant production and fetal lung maturity.