Test | Normal (reference) range | ||
First trimester | Second trimester | Third trimester | |
Prothrombin time (seconds) | 9.7 to 13.5 | 9.5 to 13.4 | 9.6 to 12.9 |
Activated partial thromboplastin time (seconds) | 23.0 to 38.9 | 22.9 to 38.1 | 22.6 to 35.0 |
Platelet count (x109/L) | 174 to 391 | 155 to 409 | 146 to 429 |
Fibrinogen (mg/dL) | 244 to 510 | 291 to 538 | 301 to 696 |
D-dimer (micrograms/mL) | 0.05 to 0.95 | 0.32 to 1.29 | 0.13 to 1.7 |
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