if your CPAP is not dialed in or theres nights you don't use it , you have a very good chance of increasing your hematocrit . essentially when your body goes below 90% oxygen saturation and is starving for air it begins to make more red blood cells to help carry more oxygen.
pub med studyMultiple linear regression analysis revealed that mean oxygen saturation, RDI, and percent of time spent at oxygen saturation <90% were significant predictors of hematocrit level, even after controlling for gender, ethnicity, 24-h urine NE, BMI, and BP (p < 0.05). The severity of OSA is significantly associated with increased hematocrit, even after controlling for possible confounding variables