A method of controlling lancing speed of a lancet structure of a portable handheld medical diagnostic device (10) includes providing an elongated lancet structure (24 406 432 450 506 606) having a skin piercing end (90 408 434 462 508 608) and a blood transport portion (92 464 510 610) adjacent the skin piercing end (90 408 434 462 508 608). The skin piercing end (90 408 434 462 508 608) when displaced makes an incision at a skin site to produce an amount of bodily fluid from the skin site and in which the blood transport portion (92 464 510 610) transports the amount of bodily fluid away from the skin site for use by a measurement system (32) in making a physiological measurement. A spring-driven motor assembly (144) is operatively connected to the lancet structure (24 406 432 450 506 606). The spring-driven motor assembly (144) displaces the lancet structure (24 406 432 450 506 606) toward the skin site to make the incision for producing the amount of bodily fluid and retracts the lancet structure (24 406 432 450 506 606) to carry the amount of bodily fluid away from the skin site. A speed control mechanism (36) is engaged with the spring-driven motor assembly (144) as the spring-driven motor assembly(144) retracts the lancet structure (24 406 432 450 506 606) thereby decelerating the lancet structure (24 406 432 450 506 606) as the lancet structure (24 406 432 450 506 606) is retracted away from the skin site.La présente invention concerne un procédé de régulation de la vitesse dincision dune structure de lancette dun dispositif manuel portable pour diagnostic médical (10) qui comprend la fourniture dune structure de lancette allongée (24 406 432 450 506 606) ayant une extrémité dincision de la peau (90 408 434 462 508 608) et une partie de transport du sang (92 464 510 610) adjacente à lextrémité dincision de la peau (90 408 434 462 508 608). Lextrémité dincision de la peau (90 408 434 462 508 608), lorsquelle est déplacée, réalise une inc
