TEST DIRECTORY | MIDx Labs

APOLIPOPROTEIN B (APO B)

Major protein constituent of low-density lipoprotein (LDL) reflecting the number of atherogenic particles.

LIS TEST CODE: APOB

CPT CODE: 82172

ALIASES: APO B, APO B / APO A1 Ratio

METHODOLOGY: Immunoturbidimetric

SPECIMEN:

- Type: Serum

- Container: Gold Top (SST) Vacutainer

- Minimum Volume Required: 1 mL

- Storage/Handling: Allow 30 minutes for blood to clot, then centrifuge specimen at 3500 RPM for 10 minutes. Maintain specimen at room temperature, in the refrigerator, or in the freezer until testing can be performed.

NOTE: If freezing is required to preserve stability, transfer serum into a separate plastic screw-cap transport container.

- Stability:

Room Temperature (20-25 °C): 3 days

Refrigerated (2-8 °C): 3 days

Frozen (-20 °C or colder): 3 months; avoid multiple freeze/thaw cycles.

- Turnaround Time: 24 hours from receipt.

Special Instructions: N/A

REJECTION REASONS: QNS, Gross Hemolysis, Gross Lipemia, Contamination, Stability Violation, Expired Container, Incorrect Container

REFERENCE RANGES:

Males & Females (mg/dL)

2 - 17 years of age:

Low: < 90

Borderline Low: 90 - 109

Acceptable: >= 110

>= 18 years of age:

Desirable: < 90

Above Desirable: 90 - 99

Borderline High: 100 - 119

High: 120 - 139

Very High: >= 140