Hemoglobin doesn't affect peripheral pulses.
A nursing diagnosis statement translated into regular English goes something like this: "I think my patient has ____(diagnosis)_____________ . He has this because he has ___(related factor(s))__. I know this because I see/assessed/found in the chart (as evidenced by) __(defining characteristics)________________."
"Related to" means "caused by," not something else. In many nursing diagnoses it is perfectly acceptable to use a medical diagnosis as a causative factor. For example, "acute pain" includes as related factors "Injury agents: e.g. (which means, "for example") biological, chemical, physical, psychological."
To make a nursing diagnosis, you must be able to demonstrate at least one "defining characteristic." Defining characteristics for all approved nursing diagnoses are found in the NANDA-I 2012-2014 (current edition). $29 paperback, $23 for your Kindle at Amazon, free 2-day delivery for students. NEVER make an error about this again---and, as a bonus, be able to defend appropriate use of medical diagnoses as related factors to your faculty. Won't they be surprised!
If you do not have the NANDA-I 2012-2014, you are cheating yourself out of the best reference for this you could have. I don’t care if your faculty forgot to put it on the reading list. Get it now. When you get it out of the box, first put little sticky tabs on the sections:
1, health promotion (teaching, immunization....)
2, nutrition (ingestion, metabolism, hydration....)
3, elimination and exchange (this is where you'll find bowel, bladder, renal, pulmonary...)
4, activity and rest (sleep, activity/exercise, cardiovascular and pulmonary tolerance, self-care and neglect...)
5, perception and cognition (attention, orientation, cognition, communication...)
6, self-perception (hopelessness, loneliness, self-esteem, body image...)
7, role (family relationships, parenting, social interaction...)
8, sexuality (dysfunction, ineffective pattern, reproduction, childbearing process, maternal-fetal dyad...)
9, coping and stress (post-trauma responses, coping responses, anxiety, denial, grief, powerlessness, sorrow...)
10, life principles (hope, spiritual, decisional conflict, nonadherence...)
11, safety (this is where you'll find your wound stuff, shock, infection, tissue integrity, dry eye, positioning injury, SIDS, trauma, violence, self mutilization...)
12, comfort (physical, environmental, social...)
13, growth and development (disproportionate, delayed...)
Now, if you are ever again tempted to make a diagnosis first and cram facts into it second, at least go to the section where you think your diagnosis may lie and look at the table of contents at the beginning of it. Something look tempting? Look it up and see if the defining characteristics match your assessment findings. If so... there's a match. If not... keep looking. Eventually you will find it easier to do it the other way round, but this is as good a way as any to start getting familiar with THE reference for the professional nurse.