. 2022 Jun 7;72(721):e556–e563. doi: 10.3399/BJGP.2021.0563

Box 1.

Blood markers included in this study and thresholds

Marker	Threshold (source)
Haemoglobin	<110 g/L for males, <100 g/L for females⁵
Platelets	>400 × 10⁹/L⁵
C-reactive protein	>7 mg/L¹⁵
Erythrocyte sedimentation rate	Previously defined age-and sex-specific thresholds¹⁵