Diagnosis of gout is based on clinical examination and arthrocentesis (to detect the presence of monosodium urate crystals in the synovial fluid).
The use of serum uric acid (sUA) levels is limited in acute gout flare and can be difficult to interpret. If acute gout attack is suspected in a patient, an elevated sUA (≥6.8 mg/dL) can lend support to the ...
The only weight loss method I've heard that increases the risk of kidney stones is bariatric surgery (PubMed, 2015).
Here's a recommendation to prevent gallstones (NIDDK.gov, pdf):
Depending on your starting weight, experts recommend losing about
1/2 to 2 pounds per week.