diff --git a/qubittool/tool.py b/qubittool/tool.py
index 3c3d767..c608137 100644
--- a/qubittool/tool.py
+++ b/qubittool/tool.py
@@ -11,7 +11,8 @@ from openpyxl.styles import PatternFill, Border, Side, Alignment
 
 from rowmodel import RowModel
 
-codex:dict = {"gDNA from cells":"BM"}
+codex:dict = {"cfDNA from Plasma":None}
+codex.update ( {"gDNA from cells":"BM"} )
 codex.update({"gDNA from Buffy Coat":"BC"})
 
 def read_qubit_doc_by_accession(keys:dict, path:str):