Coupon Codes not valid for this testing. Fasting Required: No fasting required Lab: Quest Diagnostics Specimen: Blood Results: Average processing time 3-5 days Note: Result turnaround times are an estimate and are not guaranteed. Our reference lab may need additional time due to weather, holidays, confirmation/repeat testing, or equipment maintenance. Description: RNP Antibodies have been associated with Mixed Connective Tissue disease. Alternative Name(s): Ribonucleoprotein extractable nuclear Ab