For the most accurate cholesterol reading possible without a physician's order, direct-access laboratory services (Walk-In Lab, Health Testing Centers, LabCorp Direct) allow you to order a standard venous blood draw lipid panel online and visit any Quest Diagnostics or LabCorp location — the same facilities and methodology your doctor uses, at discounted self-pay prices. Results are typically available within 1–2 business days through an online portal. This is identical in accuracy to any physician-ordered test because it uses the same laboratory infrastructure.