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Clinical · Bloodwork · continued

Which panel is worth repeating and which is worth ignoring posts 91–120

This is a continuation of a long topic, addressed by post number rather than by page. Start at post 1 · go to the accepted answer.

RA
r.aldana_pharmdTL4Pharmacist22 Aug 2025 · edited#91
ro.frisk, post #37: Adding the measurement that post #34 says would settle it. Worth separating panel as a question about the compound from panel as a question about the documentation. They get answered by different people and only one of them is answerable here. Go to post

Narrowing post #88, because the general version has more than one answer.

Glycaemic markers integrate over different periods. A point glucose and a longer-term marker disagreeing is not a contradiction; it is two different questions.

I have no interest in any supplier named above.

4 likes in reply to #37 11mo
RZ
r.zielinskiTL223 Aug 2025#92

Everything in post #91 holds. The case it does not cover is the one I have.

Something worth flagging about panel: the strongest-sounding claims in this thread are the ones with no source attached, which is the usual pattern and not a coincidence.

12 likes 11mo
MP
mira.patelTL4 Admin24 Aug 2025#93

I have three months of notes on panel and the honest summary is that the trend is real and the week-to-week numbers are noise. I nearly drew the opposite conclusion from the first fortnight.

26 likes 11mo
CB
c.boatengTL226 Aug 2025#94

Nothing in this subcategory is medical advice, and a panel with an unexpected result is precisely the situation where that matters.

0 likes 11mo
NG
np_gilmoreTL3Nurse practitioner27 Aug 2025#95
aliquot_line, post #28: Picking up post #27: that is the part I would want checked first. A trend needs at least three points to be a trend. Two points are a line and a line through noise is still a line. That distinction has done more work for me than anything else in this category. Go to post

Panel has a well-known answer and a correct answer, and the interesting work is establishing that they are the same. Nobody has done that here yet.

7 likes in reply to #28 11mo
RM
r.mensaTL228 Aug 2025#96

I read post #94 twice before replying, because I had assumed the opposite.

Lipid panel interpretation: total, LDL, HDL, triglycerides all on one panel. Reading them together is more informative than reading one value in isolation. An elevated triglyceride with low HDL is different from triglyceride elevation alone.

I would put this at better than even and not much better.

18 likes 11mo
PP
peak_purityTL329 Aug 2025#97
NS
no.silvaTL230 Aug 2025#98

The documentation on panel is better than this thread and I say that as someone who has posted in the thread.

0 likes 11mo
PR
policy_readerTL2Regular31 Aug 2025#99

An observation about panel that I cannot explain and am posting anyway, on the principle that unexplained observations are more useful public than private.

12 likes 11mo
EA
e.adeyemiTL22 Sep 2025#100
m.yilmaz, post #42: The arithmetic in post #41 is right; the assumption feeding it is the part to check. Glycaemic markers integrate over different periods. A point glucose and a longer-term marker disagreeing is not a contradiction; it is two different questions. If that is already documented somewhere, ignore me and link it. Go to post

Time of day: some biomarkers vary across the day. Cortisol in the morning differs from cortisol in the evening. Comparing results from different times of day is comparing things that are not the same.

This is the version I would want a new member to read first.

25 likes in reply to #42 11mo
DT
dexa_twice_yearlyTL3Regular3 Sep 2025 · edited#101
t.pereira, post #70: A trend needs at least three points to be a trend. Two points are a line and a line through noise is still a line. Adding this to the thread rather than to the wiki, because I am not confident enough for the wiki. Go to post

That is a cleaner way of putting what I was circling around.

7 likes in reply to #70 11mo
HF
h.friskTL24 Sep 2025#102
mira.patel, post #93: I have three months of notes on panel and the honest summary is that the trend is real and the week-to-week numbers are noise. I nearly drew the opposite conclusion from the first fortnight. Go to post

Agreed on panel, with one qualification that I think matters. The reasoning holds for the case as described. Change the starting assumption and it does not, and the starting assumption is the part nobody states.

17 likes in reply to #93 11mo
RM
r.mcalisterTL3Regular5 Sep 2025#103

Glycaemic markers integrate over different periods. A point glucose and a longer-term marker disagreeing is not a contradiction; it is two different questions.

0 likes 11mo
IB
i.balogunTL26 Sep 2025#104

I had written a reply contradicting post #100 and deleted it. Here is what survived.

A methods point on panel rather than a substantive one: if the comparison is not like for like, the difference you are measuring is the difference in method.

1 like 11mo
FD
f.demirTL2Regular7 Sep 2025#105

The arithmetic in post #102 is right; the assumption feeding it is the part to check.

Add biological variation and analytical imprecision to that base rate and the probability of a meaningless flag on a multi-analyte panel is substantial.

11 likes 11mo
AI
a.iyerTL29 Sep 2025#106
k.redgrave, post #86: A trend needs at least three points to be a trend. Two points are a line and a line through noise is still a line. A modest claim, modestly supported. Go to post

Answering the question post #104 raises rather than the one it answers.

Two people in this thread mean different things by panel and are disagreeing about the definition while believing they are disagreeing about the facts. Worth pausing to define it.

24 likes in reply to #86 11mo
BV
bias_varianceTL4Biostatistician10 Sep 2025#107

My experience of panel contradicts the reply above. I am posting it as a data point rather than as a refutation, because one person's experience is exactly that.

0 likes 11mo
MS
m.steinerTL211 Sep 2025#108

A trend needs at least three points to be a trend. Two points are a line and a line through noise is still a line.

If it helps: the failure mode here is usually boring rather than dramatic.

3 likes 11mo
IT
impurity_tableTL312 Sep 2025#109
SO
s.ostergaardTL213 Sep 2025 · edited#110

No disagreement from me. Posting only so the question does not look ignored.

32 likes 10mo
KO
k.okaforTL214 Sep 2025#111

What I want from this panel thread is the list of things that would need to be true for the claim to hold. If we can write that list, we can check it.

8 likes 10mo
KF
k.farrugiaTL3Regular16 Sep 2025 · edited#112

Adding the measurement that post #111 says would settle it.

Lipid changes during substantial weight loss are expected and their trajectory is not always monotonic. A single mid-course panel can be misleading.

2 likes 10mo
NS
ni.stanescuTL217 Sep 2025#113

Right — I had this wrong and I am glad to have read it before it mattered.

0 likes 10mo
JH
j.habermannTL3Regular18 Sep 2025#114
dexa_twice_yearly, post #101: That is a cleaner way of putting what I was circling around. Go to post

The thing about panel that took me longest to accept is that a plausible mechanism is not evidence of an effect. It is a reason to look, not a result.

19 likes in reply to #101 10mo
AP
a.petrovTL219 Sep 2025#115
AR
ambient_reviewTL3Regular20 Sep 2025 · edited#116

Panel: I have looked for the primary source twice and failed twice. Either it does not exist or it is somewhere I do not know to look, and I would like to know which.

0 likes 10mo
MA
mi.almeidaTL221 Sep 2025#117

Post #116 put the caveat in the right place and I want to underline it.

On panel the community has more anecdote than the confidence in this thread implies, and I include my own contribution in that.

28 likes 10mo
SP
s.poulsenTL3Regular22 Sep 2025#118
r.zielinski, post #92: Everything in post #91 holds. The case it does not cover is the one I have. Something worth flagging about panel: the strongest-sounding claims in this thread are the ones with no source attached, which is the usual pattern and not a coincidence. Go to post

Repeat before acting is standard practice for an isolated abnormal result on most analytes, and it is standard for a reason.

Two sources, same conclusion, and I could not rule out that one copied the other.

13 likes in reply to #92 10mo
KA
k.agyemanTL224 Sep 2025 · edited#119
m.yilmaz, post #42: The arithmetic in post #41 is right; the assumption feeding it is the part to check. Glycaemic markers integrate over different periods. A point glucose and a longer-term marker disagreeing is not a contradiction; it is two different questions. If that is already documented somewhere, ignore me and link it. Go to post

Time of day: some biomarkers vary across the day. Cortisol in the morning differs from cortisol in the evening. Comparing results from different times of day is comparing things that are not the same.

2 likes in reply to #42 10mo
NT
n.torrenceTL3Regular25 Sep 2025#120

Panel looks different depending on whether you are reading the primary literature or the summaries of it, and the difference is not in our favour.

0 likes 10mo