Table 7.
Reference ranges for common COVID-19 laboratory tests
| Laboratory test | Nonpregnant | First trimester | Second trimester | Third trimester |
|---|---|---|---|---|
| WBC (×103/mm3) | 3.50–9.10 | 5.70–13.60 | 5.60–14.80 | 5.90–16.90 |
| Platelet (×109/L) | 165.00–415.00 | 174.00–391.00 | 155.00–409.00 | 146.00–429.00 |
| D-dimer (μg/mL) | 0.22–0.74 | 0.05–0.95 | 0.32–1.29 | 0.13–1.70 |
| Ferritin (ng/mL) | 10.00–150.00 | 6.00–130.00 | 2.00–230.00 | 0.00–116.00 |
| CRP (mg/L) | 0.20–3.00 | Not reported | 0.40–20.30 | 0.40–8.10 |
| Procalcitonin (μg/mL) | 0.01–0.15 | 0.018–0.051 | 0.018–0.051 | 0.02–0.15 |
| Fibrinogen (mg/dL) | 233.00–496.00 | 244.00–510.00 | 291.00–538.00 | 373.00–619.00 |
| PT (s) | 12.70–15.4 | 9.70–13.50 | 9.50–13.40 | 9.60–12.90 |
| PTT (s) | 26.30–39.40 | 24.30–38.90 | 24.20–38.10 | 24.70–35.00 |
| INR | 0.90–1.040 | 0.89–1.05 | 0.85–0.97 | 0.08–0.94 |
| AST (U/L) | 12.00–38.00 | 3.00–23.00 | 3.00–33.00 | 4.00–32.00 |
| ALT (U/L) | 7.00–41.00 | 3.00–30.00 | 2.00–33.00 | 2.00–25.00 |
| LDH (U/L) | 115.00–221.00 | 78.00–433.00 | 80.00–447.00 | 82.00–524.00 |
| Magnesium (mg/dL) | 1.50–2.30 | 1.60–2.20 | 1.50–2.20 | 1.10–2.20 |
| Phosphate (mg/dL) | 2.50–4.30 | 3.10–4.60 | 2.50–4.60 | 2.80–4.60 |
| Troponin I (ng/mL) | 0.08 | Not reported | Not reported | 0–0.064 |
| Creatine kinase (U/L) | 39.00–238.00 | 27.00–83.00 | 25.00–75.00 | 13.00–101.00 |
| BNP (pg/mL) | <167 | Not reported | 13.50–29.50 | Not reported |
| pH (venous) | 7.31–7.41 | 7.36–7.52 | 7.40–7.52 | 7.41–7.53 |
| pO2 (mm Hg) | 90.00–100.00 | 93.00–100.00 | 90.00–98.00 | 92.00–107.00 |
| pCO2 (mm Hg) | 38.00–42.00 | Not reported | Not reported | 25.00–33.00 |
| HCO3- (mEq/L) | 22.00–26.00 | Not reported | Not reported | 16.00–22.00 |
ALT, alanine aminotransferase; AST, aspartate aminotransferase; BNP, B-type natriuretic peptide; COVID-19, coronavirus disease 2019; CRP, C-reactive protein; INR, international normalized ratio; LDH, lactate dehydrogenase; PT, prothrombin time; PTT, partial thromboplastin time; WBC, white blood cell count.
Vega. Inpatient management of COVID-19 in pregnancy. AJOG MFM 2020.