Donating blood on Sunday

[camshe]

Is it appropriate for an active LDS member to donate blood on Sunday when asked specifically by the blood bank. My wife had a fairly rare blood type and her platelets are in high demand and are generally used for just a number of patients. When they get low my wife is asked to come in ASAP. This week they asked if she could come in on Sunday. I feel it's OK - act of service and all - but does anyone have a Church guideline on this?

[scgallafent]

My suggestion would be to start with Matthew 12:10-13.