ASCP Urinalysis and Body Fluids 3

Question 1

Bence Jones proteins detected in urine are composed of:

Accepted Answer

Free monoclonal light chains (kappa or lambda)

Answer

Intact immunoglobulins

Answer

Albumin fragments

Answer

Transferrin

Question 2

Which urine finding indicates renal tubular damage in acute tubular necrosis?

Accepted Answer

Muddy brown granular and epithelial cell casts

Answer

Hyaline casts alone

Answer

WBC casts

Answer

Fatty casts

Question 3

Normal CSF total protein concentration is approximately:

Accepted Answer

15–45 mg/dL

Answer

0.5–1.0 g/dL

Answer

100–200 mg/dL

Answer

<5 mg/dL

Question 4

Which urine dipstick reaction can be falsely negative in the presence of high-dose ascorbic acid?

Accepted Answer

Glucose (oxidase method)

Answer

Leukocyte esterase

Answer

Nitrite

Answer

pH

Question 5

A synovial fluid WBC of 50,000–200,000/µL with >90% PMNs is most consistent with:

Accepted Answer

Septic arthritis

Answer

Osteoarthritis (noninflammatory)

Answer

Rheumatoid arthritis

Answer

Gout

Question 6

Which finding in amniotic fluid assessment indicates fetal lung maturity?

Accepted Answer

L/S ratio ≥2.0 with phosphatidylglycerol present

Answer

Lecithin-sphingomyelin (L/S) ratio <1.5

Answer

Absence of lamellar bodies

Answer

High bilirubin by ΔOD450