Healthy 31 year old, will a high platelet count keep me from having a breast lift w/augmentation?

If you have a high platelet count, you need to ask your hematologist if they feel that you are at increased risk for blood clots with the surgery.  If they do not, then you are a candidate. Good luck.

"Age, a previous thrombotic event, and long duration of thrombocytosis were identified as major risk factors for thrombosis, while smoking, diabetes mellitus, hyperlipidemia, and hypertension did not influence the rate of thrombotic episodes."

First check with your hematologist for level of risk.  High/Low ?   Will you need anticoagulation for surgery? 

If low risk and cleared by hematology.  Patient must be well hydrated. Shorten the surgery  time.  Consider mastopexy first and implant later.  Complication rates are lower.

If you are high risk, do not do the surgery. Nothing is worth a stroke or the loss of a finger or toe.    

Best wishes. Knowledge is power.  Luis F. Villar MD FACS

An elevated platelet count can lead to a hypercoaguable situation in some individuals that might increase the risk for pulmonary embolism. This risk can be established by your hematologist. Breast lift has a very low risk in anyone for this complication. In your particular situation I don't see any contraindication to the operation.